岩土工程学报2011，Vol.33Issue(12)：1903-1909,7.
考虑孔隙水压力效应和非线性破坏准则的浅埋地下洞室支护力上限分析
Upper bound solutions of supporting pressure of shallow cavities subjected to pore water pressure based on nonlinear failure criterion
摘要
Abstract
Due to the effect of pore water pressure,the mechnical and deformation characteristics of underground structures located in saturated soils are different from those located in completely dry soils.According to the nonlinear failure characteristics of shallow cavities,a new curved failure mechanism is constructed.By regarding the work rate of pore water pressure as an external loading work rate,the effect of pore water pressure is introduced into the virtual work rate equation of the upper bound theorem,and the upper solution expressions of supporting pressure and detaching curve of the shallow cavities subjected to pore water pressure are derived.By using variational calculation to optimize the objective function,the optimal upper solutions of supporting pressure and collapsing block shape of shallow cavity are obtained.According to the results of parametric analysis,the pore water pressure has significant influence on the supporting pressure and collapsing surface of the shallow cavities.Furthermore,both the supporting pressure and collapsing surface increase with the increase of pore water pressure coefficient.关键词
孔隙水压力/非线性破坏准则/上限定理/曲线形破坏机制/浅埋洞室Key words
pore water pressure/nonlinear failure criterion/upper bound theorem/curved failure mechanism/shallow cavity分类
建筑与水利引用本文复制引用
黄阜,杨小礼,黄戡,张道兵..考虑孔隙水压力效应和非线性破坏准则的浅埋地下洞室支护力上限分析[J].岩土工程学报,2011,33(12):1903-1909,7.基金项目
国家自然科学基金项目 （）
湖南省杰出青年基金 （）
湖南省研究生科研创新项目 （）
